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道路交通信号灯是交通安全产品中的一个类别，是为了加强道路交通管理，减少交通事故的发生，提高道路使用效率，改善交通状况的一种重要工具。适用于十字、丁字等交叉路口，由道路交通信号控制机控制，指导车辆和行人安全有序地通行。LED（发光二极管）是近年来开发生产的一种新型光源，具有耗电小（电流只有10~20mA）、亮度高（光强可达上万个mcd）、体积小（直径最小可达3mm）、重量轻（一颗发光二极管仅重零点几克）、寿命长（平均寿命10万小时）等优点。现已逐步代替白炽灯、低压卤钨灯制作道路交通信号灯。
Road traffic lights are a kind of traffic safety products. They are an important tool to strengthen road traffic management, reduce traffic accidents, improve road use efficiency and improve traffic conditions. It is suitable for intersections such as crossroads and T-shaped intersections. It is controlled by road traffic signal controller to guide the safe and orderly traffic of vehicles and pedestrians. LED (Light Emitting Diode) is a new type of light source developed and produced in recent years. It has the advantages of low power consumption (current only 10-20 mA), high brightness (light intensity up to tens of thousands of mcd), small size (diameter minimum up to 3 mm), light weight (a light emitting diode weighs only a few grams of zero), long life (average life 100,000 hours). Point. The traffic lights have been gradually replaced by incandescent lamps and low pressure halogen tungsten lamps.